Flange pressure rating 2

[executives]

Not having access to the 2003 B16.5, can someone tell me what the allowable pressure rating is for a 300 pound flange at a temperature of 300F?

Thanks

 

[jte]

What material might your Class 300 flange be made of?

 

[executives]

The flange will be made of A-105 forged material.

 

[jte]

From B16.5 2003 a material group 1.1 (which includes A-105) CL-300 flange at 300 deg F has a pressure rating of 655 psi. Don't forget to leave some margin for piping loads (tensile longitudinal and moments) which will act with the internal pressure to open up the flange.

jt